> is there exist a WMI Query to ask about process CPU utilization?
> For example, to get an information about my application process only.

Yes, this will measure the processor usage of the current process:

declare Sleep in WIN32API  integer 

nProcessID =  _vfp.processID && or specify one, eg from task manager

oWMIService = getobject("winmgmts:\\")
oItems = oWMIService.ExecQuery ;
	([Select * From Win32_PerfRawData_PerfProc_Process where IDProcess = '] + ;
	transform(nProcessID) + ['])
for each oItem in oItems
	nPercentUsed1 = val(oItem.PercentUserTime)
	nTimeValue1 = val(oItem.TimeStamp_Sys100NS)
next

for nCounter = 1 to 5
	Sleep(100)
	oItems = oWMIService.ExecQuery ;
			([Select * From Win32_PerfRawData_PerfProc_Process where IDProcess = '] + ;
	transform(nProcessID) + ['])
		
	for each oItem in oItems
		nPercentUsed2 = val(oItem.PercentUserTime)
		nTimeValue2 = val(oItem.TimeStamp_Sys100NS)

		if nTimeValue2 - nTimeValue1 = 0
			nPercentProcessorTime = 0
		else
			nPercentProcessorTime = 100 * (nPercentUsed2 - nPercentUsed1) / ;
				(nTimeValue2 - nTimeValue1)
			? transform(nPercentProcessorTime) + "% used"
		endif
		nPercentUsed1 = nPercentUsed2
		nTimeValue1 = nTimeValue2
	next
next